Braintree\Gateway::transaction PHP Method

    public function transaction()
    {
        return new TransactionGateway($this);
    }

 public function testHandlesEuropeBankAccounts()
 {
     $gateway = new Braintree\Gateway(['environment' => 'development', 'merchantId' => 'altpay_merchant', 'publicKey' => 'altpay_merchant_public_key', 'privateKey' => 'altpay_merchant_private_key']);
     $result = $gateway->customer()->create();
     $this->assertTrue($result->success);
     $customer = $result->customer;
     $clientApi = new HttpClientApi($gateway->config);
     $nonce = $clientApi->nonceForNewEuropeanBankAccount(["customerId" => $customer->id, "sepa_mandate" => ["locale" => "de-DE", "bic" => "DEUTDEFF", "iban" => "DE89370400440532013000", "accountHolderName" => "Bob Holder", "billingAddress" => ["streetAddress" => "123 Currywurst Way", "extendedAddress" => "Lager Suite", "firstName" => "Wilhelm", "lastName" => "Dix", "locality" => "Frankfurt", "postalCode" => "60001", "countryCodeAlpha2" => "DE", "region" => "Hesse"]]]);
     $transactionResult = $gateway->transaction()->sale(["customerId" => $customer->id, "paymentMethodNonce" => $nonce, "merchantAccountId" => "fake_sepa_ma", "amount" => 100]);
     $this->assertTrue($transactionResult->success);
     $collection = $gateway->transaction()->search([Braintree\TransactionSearch::customerId()->is($customer->id), Braintree\TransactionSearch::europeBankAccountIban()->is("DE89370400440532013000")]);
     $this->assertEquals(1, $collection->maximumCount());
     $this->assertEquals($transactionResult->transaction->id, $collection->firstItem()->id);
 }